1 files changed, 1 insertions, 1 deletions
diff --git a/include/ILexer.h b/include/ILexer.h
index 5680acb4e..d18b307d1 100644
--- a/include/ILexer.h
+++ b/include/ILexer.h
@@ -85,7 +85,7 @@ class ILoader {
 public:
 	virtual int SCI_METHOD Release() = 0;
 	// Returns a status code from SC_STATUS_*
-	virtual int SCI_METHOD AddData(char *data, Sci_Position length) = 0;
+	virtual int SCI_METHOD AddData(const char *data, Sci_Position length) = 0;
 	virtual void * SCI_METHOD ConvertToDocument() = 0;
 };